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METEOROLOGY | Altimetry (QFE, QNH, QNE)
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- เผยแพร่เมื่อ 4 ส.ค. 2024
- *QUESTIONS*
An altimeter adjusted to 1013hPa indicates an altitude of 3600ft- Should this altimeter be adjusted to the local QNH value of 991hPa, the altitude indicated would be:
-- 2922'
-- 3006'
-- 4278'
-- 4194'
Aviation Exam (53755)
An altimeter of an aircraft is set to1013.2hPa. The aircraft has to land on a point with an elevation of 290' where the QNH is 1023hPa. Assuming that 1hPa corresponds to 27ft, the reading on the altimeter on ground will be:
-- 20'
-- 11'
-- -10'
-- 560'
Aviation Exam (3745)
00:00 Intro
00:26 QFE, QNH, QNE Explained
11:14 Question 1
17:50 Question 2
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New lapel mic has just arrived so audio quality will be better for videos recorded from now on (hopefully). Thanks to those who gave that advice.
-- Previous Lesson Video: th-cam.com/video/XAs5Bkob4n4/w-d-xo.html
Q nh =. Nautical Height
Q fe = Fieid Elevation
Q ne = Nautical Estimate or En Route
FYI 👍
Good mnemonics!
That really helps. Nice one.
I always remembered them as FE = Field Elevation, NH = Nautical Height,, NE = Normalised Everywhere.
If that helps anyone else remember them, you're welcome.
After that and 27ft/hPa, it is just arithmetic and correct visualisation of the isobars in relation to each other. I'm lucky in that respect, as the product of a Chartered Civil Engineer and a Mathematics Teacher!
Also, when looking at a low-level chart, raised obstructions have the altitude marked first, then the height in brackets.
The first figure is what your altimeter will be reading if you hit the top of the obstruction, the second is the distance you will fall afterwards.
Thanks for your comment, Phil. I'm sure your mnemonic will be helpful for someone out there
works for me
@@VASAviation
Greeting from Japan ! I watch Japanese TH-camr who focuses on ATC, so your movie helps me to understand in multiple language :)
You're such a blessing ! You're one of my most fav TH-cam channels out there and I really appreciate all the time you take to make these videos. Ik it's old but feel like stumbled on gold haha
Thank you for doing this. I think I understood altimeters a lot better than from other explanations I've seen now. Good job! :)
Great to hear! Thanks for watching!
Very well done! I’m a student pilot and I’m gonna take the theory exams in a few months, so every bit of practice i get is useful. Thanks mate 👍
Thanks for the video. Great job!
This made sense! Thank you for posting!
Glad it was helpful!
This is the best explanation about this topic I ever saw. Thank you!
Glad it was helpful!
I totally agree with you, now I don't have to bet with answers cause I clearly know how they are calculated!!!
Well done - thank you.
thanks for the vid, hope you have a nice day ;)
Great video, thank you. 👍
Very informative, thank you:)
Very well explained. Thank you.
This is massively helpful. Thank you.
So glad it is!
Please keep making these videos on these valuable subjects. They’re massively overlooked for those, like myself and other future flyers need to know.
Thanks mate ! Great content.
My pleasure!
excelent video, thank you very much
Yes. I need it. Thx!!
Great vedio, thank you sir for that
Keep it up please!!
Wilco!
Maaan.. better than aviation school, keep posting more instructional :)
Definitely will if you like this :)
Great information! Very interesting... Thank you for this video, keep it up...
Thanks for watching!
@@VASAviation You're welcome...
Math problem at 17:57, plane is set to 1013.2 qnh, but the plane lands somewhere where its 1023 qnh. The messed up altimeter setting is now 270 feet off (negative). Airport is at 290, so the (now incorrect) altimeter will say 20. It took me like an hour to wrap my head around it.
Setting the QNH practically means setting the reference, or the 0 point of the altimeter scale. Pressure drops as the altitude increases, so, setting a lower QNH than the actual, means setting the 0 point higher than it should be, so the plane will be higher than what's indicated on the altimeter.
Funny, I had been wondering how altitude was really determined given the differences in terrain. Not a pilot but raised by one, so I think about this kind of stuff!!! XD
My only complaint is the lighting on the board. Other than that. Great content as usual!
Agreed. I don't film videos, and I know lighting can be a little hard to get right, but lessons filmed in shadows are tough to watch, and I'm sure there are plenty of resources out there.
Q code’s are still used in Amateur radio, mostly CW. I would like to know about the WW2 “R” codes that were used in the UK by the Bomber squadrons.
Sir. Its very. Simple explanation
Really useful
Thank you so much
Iam from India. Iam a cpl trainee
Very good explanation! This subject is hard to understand for many people.
Agree, job well do me here. Many thanks for that
I'm confused from which altitude i have to calculate the temperature correction error. can you please help me
Do you have Aeroméxico AM549 aborted take off comms?
Could you go over the proper steps to clear a power surge in the engine/engines?
We'll see some of the powerplant topics
Good. Just a question. Is the formula QNH=QFE+Alt(feets)/28.5 Correct?
Thanks, long duration but actually.. simple 👍
For the last question, i just subtract 1.023-1.013 = 10 hPa because i still remember that the last 2 digits behind the decimal are the significant figures rules in physics.
Can i use that ?
Affirm, it's just the difference between both pressures.
@@VASAviation roger that.. thanks for the knowlegde sir 👍
ahhhh so thankful i passed my atpl exams and dont have to worry about calculating them and practising them everyday xd
How were they? I'm focusing on finishing my MEI and then on that.
@@MichaelJohnson-fd5cx Really depends on the subject, the CAA and if you have self study or follow classes. Some subjects are really do-able and others are very hard.
Tbh, as long as you put the work and hours in to study, You should be fine! I didn’t in the start and made it a lot harder for myself then was needed. I did self study at first but changed to following classes as that motivates me more and I’m just not the type of person to self study.
Also, if you’re from the uk, consider taking your atpl with a different authority/CAA. I changed from uk CAA to Austrian CAA and the exams were a little easier. Austria is also a lot more lenient. But I’m speaking of 9 months ago when I finished so a lot could’ve changed.
Thanks. We mixing metric with Imperial? We missed Mars doing that...
Please, buy a better mic. Otherwise thanks for the video, your explanations are amazing
Saw your handle in some of the avexam comments 😂
Can you please do a gnav lesson on quj,qte,...
that's on the list :)
You like many, many other sources are explaining it as if QNE was only used above the transitiion altitude which isn't strictly true. QNE can be useful when the airpressure is outside the value that can be set on the subscale of the altimetere. I've also seen it being used in the handout for pilots of a gliding competition - not sure why, the weather there certainly wasn't extreme, I was wondering there are altimeters that can' tbe adjusted at all? Or the button has fallen off ;-)
Various sources alternate between describing QNE as the standard pressure of 1013.25hPa or the altitude indicated when the altimeter is set to that standard pressure of 1013.25hPa. This is what Skybrary says: "QNE is different to the other altimetry Q codes in that it is an altitude not a pressure (although it is commonly incorrectly described as such)." I take Skybrary is as close to authoritative as it gets, so this is how I'm using the term QNE.
where is p2?
Dear VAS, some of my comments are missing from another of your video comment section. Do you ever delete comments? If so, did you delete mine? There was no objectionable language or ethnic content in them. I am curious.
What if we are on sea level and set QFE while the airfield is actually above us?
Altimeter would read negative values
@@VASAviation I thought ab that but I wasn't sure. Thanks VASA
You'll hear "climb, climb now".
Same thing would happen at some fields below sea level when you set QNH
how did i get here so early lol
Thank you for the video! I'm starting to learn about climatology so i think I'll need this in the future 😅
Thank you for watching!
But when is QFE used instead of QNH? I just don't get it imma bang my head into the damn wall
Hi from Iraq 🇮🇶
Saw a line of toilet seats on my feed before i saw it was VASAaviation and i was like.. oops. Those were planes.
Wonderful video, where are you from ?
Plz, get a better mic.
Lapel mic just arrived
Honestly that not a big deal for me personally . The value of the content was so great I did not even pay attention to the quality of the Mike .
@@Lagrange1970
And he acknowledged getting a BETTER mic.